(a) find the capacitance of two concentric spherical shell,with a radii a and b (b)find the capacitance per unit length of two coaxial metal cylinderical tubes,of radii a and b

(a) Find the equivalent capacitance between points a and b for the group of capacitors connected as shown in the figure above. Take C1 = 2.00 µF, C2 = 14.0 µF, and C3 = 6.00 µF.(b) What charge is stored on C3 if the potential difference between points a and b is 60.0 V?

Q A solid cylindrical conductor of radius a and charge Q is coaxial with a cylindrical shell of negligible thickness, radius b> a, and charge - Q (Fig.1). Find the capacitance per unit length of two coaxial metal cylindrical tubes of radii a and b, and length L shown in the figure below. (1) 2.776, In (b) 2πε 278 (ii) Inb a (iii) 2776, In (%) απερ (iv) None of the above a L Fig. 1

ertices of a fig a express it in vects Q. 3: (a) Given Ci=2.0µF, C2=4.0µF, C3=6.0µF and C4-8.0µF (i) Find equivalent capacitance. (ii) How much energy is stored in capacitor C2? C1 H C3 12.0 V wiw nd

(a) On a particular day, it takes 9.60×103 J of electric energy to start a truck’s engine. Calculate the capacitance of a capacitor that could store that amount of energy at 12.0 V.(b) What is unreasonable about this result?                                                        (c) Which assumptions are responsible?

Some computer keyboards are based on the idea of capacitance. Each key is mounted on one end of a plunger, the other end being attached to a movable metal plate. The movable plate and the fixed plate form a capacitor. When the key is pressed, the capacitance increases. The change in capacitance is detected, thereby recognizing the key which has been pressed. The separation between the plates is 5.00 mm, but is reduced to 0.150 mm when a key is pressed. The plate area is 9.50 x 105 m?and the capacitor is filled with a material whose dielectric constant is 3.50. Determine the change in capacitance detected by the computer.

Some computer keyboards are based on the idea of capacitance. Each key is mounted on one end of a plunger, the other end being attached to a movable metal plate. The movable plate and the fixed plate form a capacitor. When the key is pressed, the capacitance increases. The change in capacitance is detected, thereby recognizing the key which has been pressed. The separation between the plates is 5.00 mm, but is reduced to 0.150 mm when a key is pressed. The plate area is 9.50 x 10-5 m² and the capacitor is filled with a material whose dielectric constant is 3.50. Determine the change in capacitance detected by the computer. 12 w. G Key Plunger Movable metal plate Dielectric Fixed metal plate LH